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Process for producing toner for electrophotography
| Details |
Inventors: Tan, Ryoji; Tanaka, Shigeyoshi; Kishi, Ken-ichi; Iguchi, Yasuyuki; Kudo, Takeo; Amano, Takashi; Kohno, Hideki;
Assignee: Hitachi Chemical Co., Ltd. (Tokyo, JP)
Primary Examiner: Martin; Roland
Assistant Examiner:
Attorney, Agent or Firm: Antonelli, Terry, Stout & Kraus
A toner for electrophotography produced by polymerizing a monomer dispersed by emulsification in the presence of a colorant and/or a magnetic powder, followed by coagulation is excellent in properties, particularly in cleaning properties, charge stability and caking resistance. |
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DETAILED DESCRIPTION What is claimed is: 1.
A process for producing a toner for electrophotography which comprises polymerizing a polymerizable monomer dispersed by emulsification in the presence of a colorant and/or a magnetic powder to prepare a principal resin component, effecting the coagulation of the resulting polymerization liquid by adding a coagulating agent in such a way that the particles in the liquid after coagulation have diameters suitable as a toner, and then heating the resulting coagulated liquid at a temperature no lower than the glass transition point of the principal resin component after coagulation.
2.
A process according to claim 1, wherein the heating of the particles is conducted by heating the polymerization liquid after coagulation.
3.
A process according to claim 1, wherein the heating of the particles is conducted at a temperature not lower than the glass transition point of the principal resin component and not higher than 150.
degree.
C.
4.
A process according to claim 1, wherein the heating of the particles is conducted at a temperature 25.
degree.
to 60.
degree.
C.
higher than the glass transition point of the principal resin component.
5.
A process according to claim 1, wherein the coagulating agent is added in the coagulation in an amount of 0.
1 to 5 times the weight of the emulsifier present in the polymerization liquid.
6.
A process according to claim 1, wherein the polymerization initiator used in the polymerization is an oil soluble initiator and/or a water soluble initiator.
7.
A process according to claim 1, wherein the dispersion by emulsification is conducted by means of a highspeed shear dispersing machine.
8.
A process according to claim 1, wherein the polymerizable monomer comprises 40 100% by weight of styrene or one or more derivatives thereof.
9.
A process according to claim 1, wherein a liquid dispersion of an offset prevention agent is added to the polymerization liquid at the time when the conversion is 95% by weight or higher.
10.
A process according to claim 1, wherein a liquid dispersion of an offset prevention agent is added to and mixed with the polymerization liquid before or after the coagulation
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Molecular Biology 
